Samsung UE55HU6900U Stuck on Standby

[delta-9]

I have a problem with this tv, It's not powering on. I've had a look over the circuit board there is a brown burn mark near a blue capacitor and I can hear a ticking noise coming from around the lower right of the black heatsink.

underneath the pcb is an insulation sheet which has been heat damaged. The blue cap 27K 1KV is connected to an ST package

ST e3 6
14DNM5
DN
64DJR 436

I cant find any datasheet for this, any help would be greatly appreciated

[nomoresonys]

Re: Samsung UE55HU6900U Stuck on Standby

https://www.ebay.ie/itm/BN44-00755A-...0AAOSwry1aL-1E
One there EUR 61 and 11 shipping, looks the same but doesn't have U at the end.

[delta-9]

Re: Samsung UE55HU6900U Stuck on Standby

They accepted an offer £43.98. I made a mistake there are two points on the insulator affected by heat
The worst was from an AOD5N40 MOSFET TO-252 of which I found a replacement
what value capacitor is 27K 1KV is it 2700pF?

Do you have any recommendations when replacing this new powerboard should I use insulation tape or Thermal Pads.
Thanks

[budm]

Re: Samsung UE55HU6900U Stuck on Standby

That MOSFET Q9101C is for the Voltage booster circuit to provide boosted Voltage for the backlights, it is driven by LED controller IC9101.
That C9101 is 27pf 1000V is the snubber cap for Q9101C which is connected between the Source and the Drain pin of the MOSFET.
So is the MOSFET tested OK? Check the RESISTANCE between S and D pin to see waht you get. It got hot may be due to bad IC9101.
Is the cap C9101 tested bad?
Samsung BN44-00755A

Pictures provided by shopjimmy.

[delta-9]

Re: Samsung UE55HU6900U Stuck on Standby

Okay I tested both meter ohm's set at 200
should I remove the C9101 capacitor there are no polarity markings

Q9101C - ST e3 614DNM5 DN 64DJR 436

114.9
06.2

Q9102C - AOD5N40 MOSFET TO-252
No reading except unconnected middle pin to drain
00.4 ohm

[budm]

Re: Samsung UE55HU6900U Stuck on Standby

I uploaded the wrong pictures of the board in post 4, I uploaded 775 instead of the 755.
Here the pictures of the 755A.
Pictures provided by shopjimmy.

[davethedude]

Re: Samsung UE55HU6900U Stuck on Standby

Hi Delta -9, did you ever figure out what to use to replace the burnt insulation? And where could one find the correct type of thermal pads or insulation tape?
Thank you

They accepted an offer £43.98. I made a mistake there are two points on the insulator affected by heat
The worst was from an AOD5N40 MOSFET TO-252 of which I found a replacement
what value capacitor is 27K 1KV is it 2700pF?

Do you have any recommendations when replacing this new powerboard should I use insulation tape or Thermal Pads.
Thanks